Segment financial information (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Schedule of segment financial information

(in thousands)	Electric utility		Bank		Other			Total
Three months ended March 31, 2014
Revenues from external customers	$	720,056	$	63,619	$	74		$	783,749
Intersegment revenues (eliminations)	6		—		(6		)	—
Revenues	720,062		63,619		68			783,749
Income (loss) before income taxes	57,166		21,624		(7,717		)	71,073
Income taxes (benefit)	21,247		7,085		(3,659		)	24,673
Net income (loss)	35,919		14,539		(4,058		)	46,400
Preferred stock dividends of subsidiaries	499		—		(26		)	473
Net income (loss) for common stock	35,420		14,539		(4,032		)	45,927
Assets (at March 31, 2014)	5,082,589		5,371,483		3,998			10,458,070
Three months ended March 31, 2013
Revenues from external customers	$	717,435	$	64,756	$	41		$	782,232
Intersegment revenues (eliminations)	6		—		(6		)	—
Revenues	717,441		64,756		35			782,232
Income (loss) before income taxes	38,547		21,752		(8,260		)	52,039
Income taxes (benefit)	13,619		7,597		(3,329		)	17,887
Net income (loss)	24,928		14,155		(4,931		)	34,152
Preferred stock dividends of subsidiaries	499		—		(26		)	473
Net income (loss) for common stock	24,429		14,155		(4,905		)	33,679
Assets (at December 31, 2013)	5,087,129		5,243,824		9,091			10,340,044